Before assuming Ihram while in the plane over the meeqat, she must say the talbiyah and make a condition that if she was preferred from completing her Umrah, she may take of her Ihram without any expiation.

https://islamqa.info/en/111784

A friend of mine is not able to take pills to stop her menstruation due to medical reasons. She is going to Saudi Arabia on 2nd March this year. Now if her menses occur before performing Tawaf and Sai what should she do if she doesn’t become pure before coming back to her country?